Bowie and elijah j



(No Model.) 2 Sheets-Sheet 1.

M. H. 'PLUNKETT.

STEAM BOILER.

No. 482,384. Patented Sept. 13, 1892.

2 T E K N U L P H M (No Model.)

STEAM BOILER.

No. 482,384. Patented Sept. 13, 1892.

UNITED STATES PATENT OFFICE.

MICHAEL H. PLUNKETT, OF BALTIMORE, MARYLAND, ASSIGN OR OF FIFTY- ONE ONE-HUNDREDTHS TO \VASHINGTON BOlVIE AND ELIJAH J. BOND, OF SAME PLACE.

STEAM-BOlLER.

SPECIFICATION forming part of Letters Patent No. 482,384, dated $eptember 13, 1892. Application filed December 26, 1391. Serial No. 416,139. (No model.)

To all whom. it may concern.- a boiler arranged, constructed, and combined Be it known that 1, MICHAEL H. PLUNKETT, as hereinafter described.

of Baltimore, in the State of Maryland, have The invention consists of certain novel feainvented a new and useful Improvement in tures, arrangement, and combination of parts,

Steam-Boilers, of which the following, taken as will appear from the annexed description 55 in connection with the accompanying drawand claims.

ings, is a specification. In the accompanying drawings, which form The invention hereinafter described relates a part of the specification, Figure 1 represents to certain improvements in steam-boilers of a vertical central section of the boiler. Fig.

the Water-tube class, and especially to that 2 is an inverted plan view taken on the line on class in which there is arranged a vertical 2 2, Fig. 1, looking upward. Fig. 3 is a side central water column having a steam space elevation of the horizontal circular hastening, in the upper part thereof, and around the said showing the tubes broken away. upper part there is arranged a series of Like letters of reference refer to like parts spheroids or globes which are connected to throughout the several views. the lower part of the central column by water- Within an outer casing T, resting upon a tubes and to the upper part by flanged thimcircular base A, there is arranged a vertical bles. The parts herein referred to are also boiler having upon the base O a central steam connected to a suitable base watern'ing, from and water chamber 1%, closed at both ends, and

20 which extend upwardly a number of waterfrom the sides of said chamber extend out tubes which form a water-jacket around the wardly and upwardly the water-tubes H, furnace, the said tubes being connected at which are expanded in said chamber at their their upper ends to a circular water-ring, lower ends and at their upper ends are exwhich isin communication with the spheroids panded in the spheroids or globes D, ar-

2 5 by means of connecting-nipples. ranged around the upper portion of the cham- Other necessary parts and details arehereber B and in communication therewith by lnafter particularly described. means of flanged thimbles D.

The object of my invention is to produce a WVithin the vertical chamber B there is boiler capable of high pressure and to obviate suitably supported an open-ended cylinder 0 the use of thick plates and pipe-coils for high 13, as shown in Fig. 1, which extends from the pressure as is now the practice and to do away grate-level to just below the water-level and with all'fiat stayed surfaces. insures a rapid circulation along the inner A further object is to provide a boiler that surface of the drum and sweeps off all partiwill give the greatest strength with the least cles of steam as soon as formed, thereby in- 3 5 thickness of metal, large steam-room, occupysuring a contact of the water with the sides ing less space, and much lighter in weight of the drum. than the ordinary type of boiler used for high- Spheroids or globes are used for the reason pressure, and so constructed andarranged as that they are capable of standing great pressto give a large heatingsurface exposed to ure and provide large steam-space.

40 the products of combustion, which circulate Upon the brackets L secured to the vertlaround and give up their heat to the water cal plates L near the bottom, there is sup and steam spaces of the boiler, thereby generported a horizontal circular base ring F, which ating steam and superheatingit before escapis arched over the door or doors, as at F, ing to the uptake,thus utilizingalarge amount (see Fig. 3,) and is connected to the bottom 5 of heat usually lost in all vertical boilers. of the chamber B by the Water-tubes I, as 5 A further object is to provide a perfect cirshown in Fig. 1. From the base-ring F exculation, thereby avoiding deposits of. seditend upwardly water-tubes E and at their up ment on the heating-surfaces and the conseper ends are connected to the circular Waterquent burning out of those parts. ring G, supported by the brackets 12, secured 50 These and other objects are carried out by to the plates L, said ring being in commuinlroo cation with the spheroids or globesD by means of nipples c. The plates L are two inches in width and are secured to the outer casing T. A circular grate m surrounds the chamber B near its lower end, as shown.

Between the globes D and the water-ring G a number of feed-water heaters 00, having the usual fire-tubes 0c, are arranged and connected together by pipes d, whereby the water entering through pipe d to the heaters and from said heaters out through pipe 6 to the water-chamber B through the pipe 01, having a hood n, so that by the time the feed-water reaches the central chamber it is of a temperature approximating closely to that of the boiler-water, thus utilizing a great quantity of heat which would otherwise be lost.

The usual fire-doors R, and the manholes 0 and 10 for the globes D and chamber B are provided.

The steam-pipe M, which conducts the steam away from the boiler, is provided with the usual hand or other valve for controlling the flow of the steam.

K represents the uptake through which the products of combustion escape.

The water-line is indicated by line S S. The brackets L are secured to the plates L and globes D and assist in supporting the latter. The water in the chamber B is drawn upwardly through the tubes H, owing to the heat of the furnace being imparted thereto, and passes into the spheroids D, where it is converted into steam. The water not so converted enters the upper portion of the chamber B through the thimbles D and passes downwardly through the cylinder B and upwardlybetween the cylinder B and the inner surface of the chamber B to the tubes H. The water which passes into the spheroids D has also another passage into the water-ring G and downwardlyinto the base-ring F through the tubes E, and from said base-ring the water enters the bottom of the chamber B through the pipes I, Where it mixes with the water in the chamber B and passes upwardly between the cylinder B and the inner surface of the chamber B to the tubes H, and the operation continues, the steam being conveyed away by the pipe M. Owing to rapid and perfect circulation all deposits of sediments on parts of the boiler and the consequent burning out of those parts are avoided.

The boiler is constructed of wrought-iron or steel, and no cast-iron parts are used where they would be exposed to the heat of the furnace.

By spheroids I mean anybody whose periphery is composed of spherical surfaces, which includes bodies whose cross-section may be circular, elliptical, oval, &c. The form of the chamber D, however, will generally be that of a globe, as shown, and is covered, as above stated, under the word spheroid.

Having thus ascertained the nature and set forth the construction of my invention, What I claim as new, and desire to secure by Letters Patent of the United States, is

1. The combination, in a steam-boiler, of a central steam and water chamber with two or more spheroids arranged around the upper end thereof and forming steam and water chambers and connected to said central chamber by steam and water passages, substantially as set forth.

2. The combination, in a steam-boiler, of a central steam and water chamber with two or more spheroids arranged around the upper end thereof and forming steam and Water chambers and connected to said central chamber by steam and water passages and water connections between the said spheroids and the lower end of the said central chamber, substantially as set forth.

3. The combination, in a steam-boiler, of a central steam and water chamber, two or more spheroids connected thereto, a clrcular water-ring arranged around and outside said spheroids, with a base water-ring and pipes connecting the said water-rings and forming thereby a water-jacket for the furnace, substantially as set forth.

4:. The combination, in a steam-boiler, of a central steam and water chamber, two or more spheroids connected thereto, a circular water-ring arranged around and outside said spheroids, a base water-ring arranged around the grate, pipes connecting said water-mugs and forming thereby a water-jacket around the furnace, with pipes connecting said base water-ring and the lower end of the central chamber, substantially as set forth.

5. The combination, in a steam-boiler, of a central steam and water chamber with two or more spheroids arranged around the upper end thereof and connected to said central chamber and an open-ended cylinder arranged within the said central chamber for promoting the circulation, substantially as set forth.

6. The combination, in a steam-boiler, of a central steam and water chamber, two or more spheroids arranged around the upper end thereof and connected to said central chamber, with a feed-water heater arranged between the spheroids and pipes conveying the water from the feed-water heater to the central chamber, substantially as set forth.

7. The combination, in a steam-boiler, of a central steam and water chamber, two or more spheroids arranged around the upper end thereof and connected to said central chamber, with a series of feed-water heaters arranged within the furnace between the spheroids and having fire-tubes therethrough and pipes connecting said feed-water heaters with the said central chamber, substantially as set forth.

8. A steam-boiler having a vertical central steam and water chamber, a series of spheroids arranged around the upper end thereof and connected to said central chamber, in

combination with a water-jacket around the name to this specification, in the presence of furnace, consistingof vertical water-tubes contwo subscribing witnesses, on this 24th dayof 1o nected to upper and lower water-rings, said December, A. D. 1891. rings being respectively in communication A 5 with the spheroids and the lower end of the MICHAEL PLUNKETT' said central chamber, substantially as set Witnesses: forth. HUMPHREY F. MORGAN,

In testimony whereof I have signed my WM. H. JONES. 

